Device and method applicable to linear tunnel axis positioning measurement

Abstract

The invention discloses a device and a method applicable to linear tunnel axis positioning measurement. The method mainly comprises the following steps: laying a central axis control point of a linear tunnel by adopting a total station, erecting a laser level meter on a centered and leveled measuring tripod through a special connecting device, accurately centering the instrument on the central axis control point, calculating the sight height of the instrument by measuring the instrument height or comparing with a reserved elevation point, so that three-dimensional absolute accurate positioning of the laser level meter is realized, a height datum line and an axis datum line with high precision visibility can be provided for a tunnel face construction site, and convenience is brought to field setting-out of a constructor. The equipment used in the method is cheap, simple in operation, high in precision and wide in application range and can perform cross-operation with other processes during setting-out, and the working efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of tunnel excavation, in particular to a device and method suitable for positioning and measuring the axis of a linear tunnel. Background technique [0002] At present, there are two main methods of surveying and setting out in the drilling and blasting excavation construction of linear tunnels. One is the precise setting out point by point of the total station, which is suitable for excavation of large sections; the other is the combination of the total station and the laser pointer. It is suitable for excavation of small radius circular section. The most frequent measurement operation during underground tunnel excavation is tunnel face stakeout. The core of tunnel face stakeout is to measure and set the drilling and blasting hole position of the cross section of the excavated tunnel under the premise of ensuring the axis stakeout is correct, which not only ensures the accuracy of the tunnel For penetration, it is n...

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Problems solved by technology

The advantage of this method is that it does not require surveyors to carry out measurement and stakeout on site for each cycle, which improves work efficiency, but the disadvantage is that the laser pointer is fixed and installed near the face of the tunnel, which is greatly affected by the blasting construction and is often used during blasting. In addition, the installation bracket is anchored on the top or waist of the excavated tunnel, and it is often displaced and deformed by the convergence deformation of the surrounding rock. Therefore, the accuracy of this method is often difficult to guarantee, and the surveyors need to make frequent adjustments. Calibration, repeated installation of brackets, and only one laser point, it is difficult to find and correct errors on site

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